Passive degasser

Abstract

The invention provides a passive degasser relating to a device for on line detaching gas in slurry lifted during oil exploration drilling, which is particularly suitable for the passive degasser. The passive degasser comprises a pot body, wherein the pot body is provided with a slurry inlet and a slurry outlet; the upper part of the pot body is the slurry inlet end; the lower end of the pot body is the slurry outlet end; and a slurry treatment body is arranged in the pot body. In the invention, the slurry treatment body is arranged to disperse and degas the slurry to be treated, and under a circumstance of having no power source drive, the slurry can be further diffused, that is fully dispersed, therefore, the degassing efficiency is effectively increased; and an airtight construction is arranged on the pot body to ensure that the slurry can be under an airtight condition in the whole degassing process of the degasser and all the gases collected by a sample air pump are the gases detached in treating the slurry in the pot body so as to provide guarantee for the accuracy of sample gas collecting data and for detecting the true gas content of a stratum.

Description

technical field [0001] The invention belongs to equipment for comprehensive mud logging and gas logging, and relates to a device for on-line degassing of mud proposed in oil exploration and drilling, and is especially suitable for a passive degasser, that is, the degasser does not need to be driven by a power source. Background technique [0002] The degassing device is an important part of the comprehensive mud logging and gas logging equipment. It shoulders the important task of whether the sample gas can better represent the real gas content of the formation, and directly affects the accuracy of oil and gas field evaluation. [0003] The industry's research on its improvement has never stopped. [0004] For example, the published Chinese patent "200410059804.5 A system for removing gas from mud and analyzing gas contained in mud" describes a physical and chemical analysis device for gas extracted online from mud proposed in oil exploration drilling, mentioning Degassing ...

AI Technical Summary

Problems solved by technology

[0005] The industry generally believes that the degasser has generally experienced the first generation of degasser: that is, a square metal box is processed into a concave shape at the bottom, and the middle lead-out pipeline is connected to the suction pump. This device floats on the mud page and generally has no power source. , which belongs to a float type degasser, and its degassing efficiency is low

The second-generation degasser is an electric degasser. The motor drives the stirring rod to stir in the degassing barrel. The purpose is to break up the mud and separate the gas in the mud, and then pump the gas to the mud logging room through the sample gas pump. , the degassing efficiency has been improved, but due to the great influence of the change of the liquid level of the mud tank, the mud flow is unstable, and the slurry inlet of the degassing device does not have a good flow limiting measure, so that the mud is easily pumped to the recorder. The well room caused damage to the equipment. For this reason, it is often necessary to adjust the draft of the degasser by raising and lowering it, which affects the operating efficiency.

[0008] According to the different viscosities of the mud to be treated, the strength requirements for crushing the mud are not the same. Therefore, energy saving and environmental protection of passive degassers are highly valued by the market, but the known technology is not suitable for degassers without power supply. The degree of fragmentation of the mud in the source degasser is poor and unstable, and the mud easily forms a vortex in the tank body, which directly affects the degassing efficiency; due to structural reasons, the existing degasser is not suitable for gas collection, or the gas Poor collection

Images